/**
 * ref: http://www.anyexample.com/programming/java/java_simple_class_to_compute_sha_1_hash.xml
 */

package moddb;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
 
public class AeSimpleSHA1 {
 
  private static String convertToHex(byte[] data) {
    StringBuffer buf = new StringBuffer();
    for (int i = 0; i < data.length; i++) {
      int halfbyte = (data[i] >>> 4) & 0x0F;
      int two_halfs = 0;
      do {
          if ((0 <= halfbyte) && (halfbyte <= 9))
              buf.append((char) ('0' + halfbyte));
          else
            buf.append((char) ('a' + (halfbyte - 10)));
          halfbyte = data[i] & 0x0F;
      } while(two_halfs++ < 1);
    }
    return buf.toString();
  }
 
  public static String SHA1(String text) 
      throws NoSuchAlgorithmException, UnsupportedEncodingException  {
    MessageDigest md;
    md = MessageDigest.getInstance("SHA-1");
    byte[] sha1hash = new byte[40];
    md.update(text.getBytes("iso-8859-1"), 0, text.length());
    sha1hash = md.digest();
    return convertToHex(sha1hash);
  }
}
